Release v6.0.3

Bug Fixes
*  Windows USB connectivity issues
*  Don't fetch prevtx's on force-bip143 coins
*  Re-enable DEBUGLINK commands through keepkectl

New Features
*  Reduced dependency on the rlp package (only keepkeyctl depends on it now)
*  Nano support (firmware not yet signed)
*  Grostlecoin support (firmware not yet signed)
*  CI, running against the emulator through CircleCI

Bump version: 6.0.2

Release v6.0.1

Release v5.10.2

Release v5.9.1

Release v5.9.0

Release v5.8.0

Release v5.0.0

Merge pull request keepkey#19 from keepkey/py3-multi-sig

Fix base58 functions and protobuf build

Update to v4.0.1 of device protocol